How to Convert Image Formats (JPG, PNG, WebP) the Right Way
Images come in several formats, and picking the right one affects file size, quality and whether features like transparency work. Converting between them is simple once you know what each format is good at.
The main formats
- JPG (JPEG): best for photographs. Small files, but uses lossy compression, so it discards some detail and does not support transparency.
- PNG: best for graphics, logos and screenshots. Lossless and supports transparency, but files are larger for photos.
- WebP: a modern format that gives smaller files than both JPG and PNG at similar quality, with transparency support. Ideal for the web.
- GIF: limited to 256 colours; mainly used for simple animations now.
Choosing the right format
Use JPG for photos you want to keep small, PNG when you need crisp edges or transparency, and WebP when you want the best of both for a website. A common mistake is saving a photograph as PNG — the file becomes needlessly huge with no visible benefit.
Converting without losing quality
Converting from a lossy format (JPG) to a lossless one (PNG) cannot restore detail already discarded — it just freezes the current quality in a larger file. Converting the other way, or between formats of similar type, is generally safe. For the cleanest results, always start from the highest-quality original you have rather than a copy that has already been compressed several times.
A note on privacy
Image files can carry hidden metadata and may be personal. Our image converter runs entirely in your browser, so your pictures are never uploaded to a server — useful for anything private, and it works offline once loaded.
What actually happens when you convert
It helps to picture what's going on under the hood. A converter decodes the image into raw pixels in memory, then re-encodes those pixels using the rules of the new format. That's why converting a JPG to PNG can't magically sharpen a soft photo — the detail JPG already threw away is gone for good, and PNG just stores the slightly-soft result in a bigger, lossless file. Go the other way, PNG to JPG, and you'll shed a little detail to save space. The practical lesson: every time you re-save a lossy format you lose a sliver of quality, so always convert from your best original, never a copy of a copy.
Transparency: the feature people forget
If your image needs a see-through background — a logo to drop onto a coloured banner, say — the format suddenly matters a lot. JPG simply can't do transparency, so save a logo as JPG and those clear areas turn into an ugly white box. PNG and WebP both keep transparency intact. So before you convert any graphic with a transparent background, make sure you're heading somewhere that supports it.
Frequently asked questions
Does converting an image reduce its quality?
Only when the destination is lossy (like JPG) or you turn the quality setting down. Converting into a lossless format such as PNG won't add quality, but it won't strip any either — it just freezes what you have in a larger file.
Is WebP safe to use everywhere now?
For the web, yes — every current browser supports it and it usually beats both JPG and PNG on size. For emailing files to people or opening them in older software, JPG and PNG are still the safest universal picks.
Why did my converted file get bigger instead of smaller?
You probably turned a photo into a PNG. PNG is lossless, so a detailed photograph balloons in size with no visible benefit. For photos, stick to JPG or WebP.
The bottom line
Match the format to the job — JPG for photos, PNG for graphics and transparency, WebP for the web — and always convert from your best original. Our private, in-browser converter handles the switch in a click.